Pipe and Dynamic Thermostatic Valve and Dynamic Radiator and Pipe Type72
by International Energy Agency
This combined unit has been created to avoid a large number of
units. In consists of a pipe element followed by a thermostatic valve, a
radiator and another pipe. This type is documented in AN17-90040302,
document M14. The pipes are the same as in the free pipe TYPE 70.
The thermostatic valve corresponds to the specification of the
Annex 10 data bank with some simplifications: the valve temperature depends
only on the water temperature and on the ambient temperature. The hydraulic
is taken into account via the valve authority (in this exercise, the valve
authority is 1).
There is a hysteresis as a heat capacitance is taken into account.
The radiator model is the model proposed in the Annex 10 data bank with
dynamic but only one element: the thermal capacitance is concentrated in
one point located at the exhaust. There are two modes: in mode 1, the nominal
power is given as a variable else the radiator coefficient is known.
dQ/dt = k* deltlog**n
Caution: with a nil heat capacitance , the type will not work!!
Ref: IEA Annex 17:BEMS Synthesis Report Univ. of Stuttgart
June 27, 1991 AN17-910627-01 and AN17-900425-02, RCHAUM 17